Background and Objective: In recent years, numerous studies have suggested dysfunction in brain symmetry as the reason behind developmental stuttering. The purpose of this study was to validate the theory of reversed right hemisphere asymmetry in developmental stutters by quantified EEG.

Materials and Methods: 13 Subjects with developmental stuttering, 7 to 23 years old were studied using QEEG recordings. The results were compared with Neuroguide and LORETA databases.

Results: We observed the following results: 1-the highest concentration of delta waves were seen in the left frontal and left temporal lobes. 2- the highest concentration of alpha 1 waves were seen in the left hemisphere, especially the temporal lobe. 3- the highest concentration of alpha 2 waves were seen in the left hemisphere, the middle frontal and superior temporal gyri. 4- the highest concentration of beta waves were seen in the right hemisphere and temporal and parietal lobes. 5- beta 3 was seen in low concentration in the left hemisphere and left frontal lobe, whereas a high concentration was found in the left and right cingulate gyri.

Conclusion: Based on the results of this study, the theory of reversed right hemisphere asymmetry in developmental stutters received the most confirmation.